i was browsing the net', when i came across this-(edit-deleted Link-just go to PS2updates.com)
apparently, with an easy to download mod, you can literally "unlock" content Rockstar had hidden deep within the games code. In this case, full graphic sex.
If you dont believe me or this link, just go to googlenews and type the words "grand theft" and "sex".
Now Im REALLY interested in GTA:PSP